This activity was first developed at the laboratories of Glasgow Scientific Services. SSERC became involved via a collaboration with the Scottish Food and Drink Federation.

From a chemistry point of view, the activity uses the context of food colourings as the context for work on chromatography.

The extraction is the novel part: it uses Solid Phase Extraction (SPE) cartridges to extract the colouring from soft drinks which can then be eluted with a smaller volume of a  different solvent, thus being concentrated enough for analysis by paper chromatography or TLC.

Colour extraction (Pupil)

Colour extraction (Teacher / Technician)

Chromatography (Pupil)

Chromatography (Teacher / Technician)

Colour extraction risk assessment

Introductory powerpoint

Discussion activity on food additives

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